Insurance and bonds

What is bond capacity in construction?

Bond capacity, or bonding capacity, is the maximum amount of bonded work a surety company will support for a contractor, usually stated as a single job limit and an aggregate limit for all work on hand.

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Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

Bond capacity is how much bonded work a surety will back for a contractor. It usually comes as two numbers: a single job limit, the largest contract the surety will bond, and an aggregate limit, the total of all bonded backlog the contractor can carry at once. A contractor with a $3 million single and $8 million aggregate can bid a $2.5 million school, but not if it already has $6.5 million of uncompleted bonded work.

Capacity is not a fixed entitlement. It is the surety's judgment about how much work the contractor can finish without failing, and it is reviewed each year or whenever a big job is on the table.

What sureties look at

  • Capital: working capital and net worth on CPA-prepared financial statements, often reviewed or audited at higher bonding levels.
  • Work in progress: a current WIP report showing estimated profit, overbilling, and underbilling by job.
  • Character and experience: the size and type of jobs the company has completed, and the people running them.
  • Banking: line of credit size and how much is drawn.
  • Profit history: whether job margins hold or fade from bid to completion.
  • Personal indemnity: owners usually sign personal indemnity agreements backing the bonds.

Example: why capacity moved

Picture a site contractor with $1.2 million of working capital. Last year its surety supported a $4 million single and $10 million aggregate. This year two jobs faded badly: estimated gross profit dropped and the WIP shows heavy underbilling. Working capital fell to $900,000. The surety holds the single limit but trims the aggregate, and asks for quarterly WIP reports. Nothing about that is a punishment. It is a signal that the surety wants to see the margin problem fixed before it backs more volume.

Some sureties start from a multiple of working capital or equity, but the multiple varies by surety, by the type of work, and by the quality of the financial statements. Ask your bond agent how your surety looks at it.

U.S. Small Business Administration surety bond guarantees

Small contractors who cannot get bonded in the standard market may qualify for the U.S. Small Business Administration's Surety Bond Guarantee program. U.S. Small Business Administration guarantees bid, payment, performance, and ancillary bonds issued by participating sureties on contracts up to $9 million for non-federal work and up to $14 million for federal contracts.

Common mistakes

  1. Sending the surety stale or internally prepared financials and expecting a big limit.
  2. Pulling cash out of the company right before year end, which lowers working capital.
  3. WIP reports that do not tie to the financial statements.
  4. Bidding a job above the single limit and asking for the bond the day before.

Related terms

Bond capacity ties to bid bonds, performance bonds, backlog, and working capital. For more detail, read how bonding capacity is calculated for contractors and construction financial statements bonding companies want. A clean WIP from job costing and WIP automation makes surety reviews faster.

Frequently asked questions

How is bonding capacity calculated?

Each surety uses its own underwriting, based on working capital, net worth, WIP, experience, and profit history. There is no single industry formula.

What is the difference between single and aggregate bond limits?

The single limit is the largest one job the surety will bond. The aggregate is the total uncompleted bonded work the contractor can carry at once.

How can a contractor increase bond capacity?

Build working capital, keep profits in the company, get CPA-prepared statements, keep WIP accurate, and complete jobs at or above bid margin.

What are the U.S. Small Business Administration bond guarantee limits?

SBA states its program covers contracts up to $9 million for non-federal work and up to $14 million for federal contracts.

Sources

  1. U.S. Small Business Administration: Surety bonds
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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